How to usefind() Method in Javascript
In this approach, we use the find method, search for the first non-repeated element in an array. then we use a ternary operator to display either the element or a message indicating that all elements are repeated.
Syntax:
array.find(function(currentValue, index, arr),thisValue);
Example: Below is the implementation of the above approach using Find method.
let arr = [9, 4, 9, 6, 7, 4];
let nonRepeated = arr.find(
(num) =>
arr.indexOf(num) === arr.lastIndexOf(num)
);
let result =
nonRepeated !== undefined
? "The first non-repeated element is: " +
nonRepeated
: "All elements in the array are repeated.";
console.log(result);
Output
The first non-repeated element is: 6
JavaScript Program to Find the First Non-Repeated Element in an Array
Finding the first non-repeated element in an array refers to identifying the initial occurrence of an element that does not occur again elsewhere within the array, indicating uniqueness among the elements.
Examples:
Input: {-1, 2, -1, 3, 0} Output: 2 Explanation: The first number that does not repeat is : 2 Input: {9, 4, 9, 6, 7, 4} Output: 6 Explanation: The first number that does not repeat is : 6
We have common approaches to perform this:
Table of Content
- Using For Loop in JavaScript
- Using find() Method
- Using map() Method
- Using Array Filter Method:
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